EP4214417A1 - Kolben-zylinder-baugruppe für einen radialkolbenverdichter sowie radialkolbenverdichter - Google Patents
Kolben-zylinder-baugruppe für einen radialkolbenverdichter sowie radialkolbenverdichterInfo
- Publication number
- EP4214417A1 EP4214417A1 EP21777709.3A EP21777709A EP4214417A1 EP 4214417 A1 EP4214417 A1 EP 4214417A1 EP 21777709 A EP21777709 A EP 21777709A EP 4214417 A1 EP4214417 A1 EP 4214417A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- piston
- cylinder
- eccentric
- transmission element
- support surface
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B27/00—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders
- F04B27/04—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
- F04B27/053—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement with an actuating element at the inner ends of the cylinders
- F04B27/0531—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement with an actuating element at the inner ends of the cylinders with cam-actuated distribution members
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B27/00—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders
- F04B27/04—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
- F04B27/0404—Details, component parts specially adapted for such pumps
- F04B27/0409—Pistons
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B27/00—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders
- F04B27/04—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
- F04B27/0404—Details, component parts specially adapted for such pumps
- F04B27/0414—Cams
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B27/00—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders
- F04B27/04—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
- F04B27/0404—Details, component parts specially adapted for such pumps
- F04B27/0423—Cylinders
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B27/00—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders
- F04B27/04—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
- F04B27/053—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement with an actuating element at the inner ends of the cylinders
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B37/00—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00
- F04B37/10—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00 for special use
- F04B37/12—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00 for special use to obtain high pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
- F04B9/02—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical
- F04B9/04—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical the means being cams, eccentrics or pin-and-slot mechanisms
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
- F04B9/02—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical
- F04B9/04—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical the means being cams, eccentrics or pin-and-slot mechanisms
- F04B9/047—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical the means being cams, eccentrics or pin-and-slot mechanisms the means being pin-and-slot mechanisms
Definitions
- Piston-cylinder assembly for a radial piston compressor and radial piston compressor
- the invention relates to a piston-cylinder assembly for a radial piston compressor according to the preamble of claim 1 and a radial piston compressor having a plurality of piston-cylinder assemblies distributed uniformly in a circumferential direction.
- the invention relates to a piston-cylinder assembly for a radial piston compressor that is used for compressing refrigerant, with CO2 (refrigerant R744) being used as the refrigerant.
- This refrigerant is compressed in the high-pressure range to pressures of 140 bar or higher, so that the piston-cylinder assembly is subject to high mechanical loads.
- the publication EP 1 553 291 A2 deals with a reciprocating piston machine which is said to be suitable as a compressor for a CO2 vehicle air conditioning system.
- the reciprocating piston machine has radially directed piston-cylinder units distributed evenly over the circumference and an eccentric shaft.
- the eccentric shaft extends through a housing body enclosing the cylinder and, by means of its eccentric, controls the stroke of the piston, ie the radially outwardly directed compression movement of the piston in the direction of top dead center of the piston movement.
- the return movement of the pistons is controlled by a common control ring which engages in a recess in the pistons (cf. in particular FIG. 3 of EP 1 553 291 A2).
- the disadvantage is that the control ring is in controlling sliding contact with the piston via an inner control surface. This sliding contact can lead to wear and component failure.
- Another disadvantage is that the piston body has a flat contact surface (the “inner face 15”) at its end facing the eccentric, with which the piston is in direct contact with the outer ring of a roller bearing that is arranged on the eccentric. The piston body is therefore exposed to high loads. There is also a constant change in the contact surface between the piston and the bearing outer ring. From the document DE 102012 005 297 A1, a piston-cylinder assembly for a radial piston compressor is known, which is said to be suitable for compressing the refrigerant CO2 (refrigerant R744).
- the stroke movement of the pistons is generated via an eccentric which is arranged on a drive shaft.
- the eccentric has a roller bearing with a bearing outer ring.
- a transmission element designed as a connecting rod is supported on the outer lateral surface of the bearing outer ring via a concave support surface.
- a connecting rod eye is provided, via which the connecting rod is articulated to the piston by means of a gudgeon pin.
- the piston therefore has a receiving bore for the piston pin.
- the disadvantage of the piston-cylinder assembly known from DE 10 2012 005 297 A1 is that both the high forces occurring during the stroke movement/compression movement of the piston in the direction of top dead center (TDC) and the during the intake movement of the piston in The forces occurring in the direction of bottom dead center (UT) act on the connecting rod or the piston via the piston pin.
- TDC top dead center
- UT bottom dead center
- the piston pin and the seating areas for the piston pin on the connecting rod represent component areas that are subjected to critical loads.
- small-dimensioned radial piston compressors e.g.
- the pistons have small diameters and the piston pins can also only have small diameters. Due to the high loads to which piston-cylinder assemblies of radial piston compressors for the refrigerant CO2 are exposed, very high surface pressures occur in the construction known from DE 10 2012 005297 A1, particularly in the connecting area of the piston pin/connecting rod eye. There is therefore a risk of wear and premature component failure of the piston pin and/or the connecting rod in the area of the connecting rod eye.
- the piston itself is also exposed to high surface pressures due to the high loads that occur in the area of the bore for the piston pin. Therefore, wear and premature component failure can also occur in the piston.
- Another disadvantage is that the bore for the piston pin mechanically weakens the piston.
- the connecting rod takes up a large amount of space and has a relatively complex shape.
- the connecting rod extends in the radial direction over a large length, and at its end facing the piston it has connecting rod eyes and at its end facing the eccentric it has active surfaces which interact with controls which are L-shaped in cross section. The reset movement is transmitted to the piston via the control rings.
- the invention is based on the object of specifying a piston-cylinder assembly which is of robust design and at the same time compact, i.e. takes up little installation space. There should be no mechanical weakening of the piston and relatively low surface pressures should occur even at high compression pressures.
- the object of the invention is also to specify a robust radial piston compressor which is suitable for the high pressures and large forces that occur when the refrigerant CO2 is compressed.
- the piston-cylinder assembly according to the invention for a radial piston compressor comprises a piston, a cylinder bore in which the piston is arranged to be displaceable along a center line of the cylinder bore, a drive shaft with an axis of rotation and with a cylindrical eccentric whose center is spaced from the axis of rotation of the drive shaft , wherein the piston can be moved by the cylindrical eccentric during a rotary movement of the drive shaft in the cylinder bore in the radial direction away from the drive shaft outwards up to a top dead center (TDC), and a transmission element which transmits the movement of the eccentric to the piston to generate the movement of the piston in the cylinder bore away from the drive shaft outside, wherein the transmission element has a first support surface with which the transmission element is supported on a cylindrical surface of the eccentric.
- TDC top dead center
- the piston has a concave first active surface facing the transmission element and the transmission element has a convex second support surface facing the first active surface, the first active surface and the second support surface forming a positive connection effective in the circumferential direction of the eccentric, and it is a cylindrical piston guide ring is provided, through which the piston can be moved in the cylinder bore, starting from top dead center (TDC) in the radial direction towards the drive shaft and directed inwards to a bottom dead center (UT), the piston having a convex surface facing the inner surface of the piston guide ring has a shaped second effective surface, which forms an effective positive connection with the inner lateral surface of the piston guide ring in the direction of the center line of the cylinder bore.
- TDC top dead center
- UT bottom dead center
- the stroke movement of the piston is therefore transmitted from the eccentric via the first support surface to the transmission element, and the transmission element transmits the stroke movement via the convex-shaped second support surface of the transmission element and the concave-shaped first effective surface of the piston to the piston.
- a convex-shaped second active surface is formed on the piston, which is in active connection with the inner lateral surface of the piston guide ring.
- the piston guide ring causes the return movement of the piston from top dead center OT to bottom dead center UT.
- the surface pressure that occurs in the contact surface between the convex second support surface of the transmission element and the concave first effective surface of the piston is significantly lower, even at high compression pressures, than the surface pressure that occurs in the case of the document DE 10 2012 005 297 A1 in the area of the piston pin, the connecting rod eye and the location hole for the piston pin in the piston body.
- the contact surface between the convex second support surface of the transmission element and the concave first effective surface of the piston is so large due to the shape of the two surfaces that even with the high Compression pressures that occur with radial piston compressors for the refrigerant CO2, the surface pressures do not reach critical values. This prevents premature wear of the components and the components achieve the required service life.
- the transmission element can be made very compact, so that it only takes up a small amount of space, because the transmission element is not connected to the piston and no active surfaces have to be formed on the transmission element, which interact with a controller via which the return movement is transferred to the pistons.
- the piston guide ring acts directly on the piston with its inner lateral surface via the second effective surface formed on the piston body.
- the transmission element can therefore be very compact and its shape as well as its choice of material can be specially adapted for its task of transmitting the stroke movement for the compression stroke to the piston while at the same time taking up as little space as possible.
- the compression stroke is where the greatest mechanical stress occurs during a piston work cycle. It is therefore advantageous that the construction according to the invention makes it possible to design the transmission element in such a way that it is optimally adapted to the task of transmitting the compression stroke movement.
- the first support surface of the transmission element can be designed as a flat surface, e.g. as a flat surface in the shape of a circular disk.
- the flat surface interacts with the cylindrical lateral surface of the eccentric or a cylindrical outer ring of a roller bearing arranged on the lateral surface of the eccentric.
- the first support surface of the transmission element is a flat surface or a concave cylinder jacket section with a first support surface radius, the first support surface radius corresponding to the radius of the cylinder jacket surface of the eccentric. If the first support surface is designed as a flat surface, then there is line contact between the first effective surface and the cylinder jacket surface of the eccentric. Is the first support surface of the transmission element is designed as a concavely shaped cylinder jacket section, compared to an embodiment with a flat first support surface, a larger contact surface is achieved between eccentric and transmission element, which leads to lower surface pressures at a given mechanical load.
- the second support surface of the transmission element is a cylinder jacket section with a second support surface radius and the first effective surface of the piston is a cylinder jacket section with a first effective surface radius, or the second support surface of the transmission element is a spherical surface section with a second support surface radius and the first Effective surface of the piston is a ball socket with a first effective surface radius, wherein the second support surface radius and the first effective surface radius are equal.
- the piston is secured against twisting about its longitudinal axis.
- Such an anti-twist device for the piston can be useful and advantageous if a constant angular position of the piston relative to the cylinder bore and the housing in which the cylinder bore is arranged is of interest.
- the piston can have a piston valve which has to interact with an inflow channel arranged in the housing for the fluid to be compressed.
- an axial lock In order to prevent the transmission element, which is designed as a cylinder jacket section, from migrating in the axial direction, there must be an axial lock.
- Such an axial lock can be formed, for example, by contact surfaces protruding in the radial direction and/or by contact rings, snap rings or similar elements inserted in grooves in the piston body or the housing.
- the piston can rotate about its longitudinal axis. However, it must not be secured against migration in the axial direction, because the spherical cap-shaped contact surface between the transmission element and the piston holds the transmission element in place in the axial direction.
- the transmission element is automatically secured/centered axially to the axis of the piston by the spherical surface section and the ball socket. An additional axial securing of the transmission element is then not required.
- the second effective surface of the piston is a cylinder jacket section with a second effective surface radius, the second support surface radius of the transmission element and the second effective surface radius of the piston having the same center point, the center point on the cylinder surface of the eccentric being the point in which the center line of the cylinder bore penetrates the cylinder surface of the eccentric, and the sum of the radius of the eccentric and the second effective surface radius of the piston corresponds to the radius of the inner lateral surface of the piston guide ring.
- the piston guide ring is always in contact (without loss of contact) with the respective piston. This avoids additional contact changes and sliding displacement movements between the piston guide ring and the piston, which has dynamic advantages and advantages in terms of wear. Acoustic advantages are also achieved because there are no rattling noises.
- a contact zone between the second support surface of the transmission element and the first effective surface of the piston and/or between the cylinder surface of the eccentric and the first support surface of the transmission element is slightly convex in the direction transverse to the radii of curvature of these surfaces.
- This convex shape of the contact zone is also referred to as a "spherical shape".
- One advantage of a convex or crowned shape of the contact zones mentioned is that any angular misalignments between the eccentric axis and a normal to the piston axis are compensated for.
- the forces can also be easily transferred from the eccentric to the transmission element or from the transmission element to the piston when the eccentric axis is not exactly perpendicular to the longitudinal axis of the piston. Due to the convex or crowned shape of the contact zones, the piston-cylinder assembly according to the invention is insensitive to deviations in the angle between the eccentric axis of rotation and the longitudinal axis of the piston from the value of 90° that occur during production or during operation.
- the eccentric can be a cylindrical disk connected to the drive shaft.
- the eccentric can be formed integrally and in one piece with the drive shaft.
- the transmission element can be supported directly with its first support surface on the cylindrical lateral surface of the eccentric.
- the cylindrical surface of the eccentric is the cylindrical surface of the eccentric itself.
- the cylinder surface of the eccentric is a cylindrical outer surface of an outer ring of a roller bearing, the roller bearing being arranged on the eccentric.
- the rolling bodies of the rolling bearing can be in direct contact with the lateral surface of the eccentric, or a bearing inner ring can be arranged between the rolling elements and the lateral surface of the eccentric.
- the outer lateral surface of the bearing outer ring then forms the cylinder surface of the eccentric, which interacts with the first support surface of the transmission element.
- the roller bearing considerably reduces the friction between the eccentric and the transmission element in comparison to a construction in which the transmission element is supported with its first support surface directly on the lateral surface of the eccentric.
- two piston guide rings are provided, which are arranged spaced apart from one another in the axial direction of the eccentric, with two second active surfaces being formed on the piston, with each second active surface being assigned to an inner lateral surface of a piston guide ring.
- At least part of the second effective surface formed on the piston or parts of the second effective surface formed on the piston are offset outwards in the direction perpendicular to the center line of the piston and in direction perpendicular to the first effective surface of the piston interacting with the transmission element spaced radially outward from the centerline of the piston.
- the piston-cylinder assembly takes up little space both in the axial direction of the eccentric and in the radial direction of the eccentric and is very compact.
- the transmission element is made from a metal or a metal alloy with a low coefficient of sliding friction, in particular from copper, bronze or a brass alloy. Due to the low surface pressures to which the transmission element is exposed in the construction according to the invention, the material for the transmission element can be selected so that the sliding friction between the transmission element and the cylinder surface of the eccentric or the first effective surface of the piston is minimized. In addition to the advantage of lower sliding friction, favorable properties with regard to emergency operation and insufficient lubrication are also achieved with the choice of material.
- the first support surface of the transmission element and/or the first effective surface of the piston has a recess that forms a lubricant reservoir. This ensures an adequate supply of lubricant to the contact surfaces at all times.
- FIG. 1 shows a first embodiment of a piston-cylinder assembly according to the invention in a radial half section
- FIG. 2 shows a second embodiment of a piston-cylinder assembly according to the invention in a radial half section;
- FIG. 3 shows an enlarged view of area D from FIG. 2;
- FIG. 4 shows a third embodiment of a piston-cylinder assembly according to the invention in a radial half section
- FIG. 5 shows a fourth embodiment of the piston-cylinder assembly according to the invention in an exploded view
- FIG. 7 shows a radial piston compressor with piston-cylinder assemblies according to the invention.
- the piston-cylinder assembly includes a drive shaft 4, not shown in detail in FIG. 1. Only the axis of rotation 5 of the drive shaft 4 is shown in FIG. Pistons 1 are distributed around the drive shaft 4 in the circumferential direction.
- the center point 7 of the eccentric 6 is offset by a distance from the axis of rotation 5 of the drive shaft 4 to generate the eccentricity.
- the eccentric 6 has a cylindrical surface 10 with a radius 17 as the lateral surface.
- the piston-cylinder assembly according to the invention also includes a cylindrical piston guide ring 13 which has an inner lateral surface 14 .
- a transmission element 8 is arranged between the eccentric 6 and the piston 1 of a piston-cylinder assembly. With the transmission element 8, the stroke of the eccentric 6 is transmitted to the piston 1, so that it can start the compression movement in Executes towards top dead center OT.
- the transmission elements 8 are supported directly on the cylinder surface 10 of the eccentric 6 via a first support surface 9 .
- the first support surface 9 is designed as a concavely curved cylinder jacket section surface with a first support surface radius 16 .
- the first support surface radius 16 corresponds to the radius 17 of the cylinder surface 10.
- the first support surface 9 and the cylinder surface 10 are thus designed to be complementary to one another.
- the first support surface 9 could also have a concave shape that differs from the circular ring shape.
- the transmission element 8 has a convex-shaped second support surface 12 .
- the second support surface 12 is designed as a cylinder jacket section surface with a second support surface radius 19 .
- the second support surface 12 could also have a convex shape deviating from the cylindrical shape instead of a cylinder jacket section shape.
- the piston 1 is supported on the second support surface 12 of the transmission element 8 via a first active surface 11 formed on the piston 1 .
- the first effective surface 11 of the piston 1 is concave in shape.
- the first effective surface 11 of the piston 1 is designed as a concave cylinder jacket section surface with a first effective surface radius 22 which corresponds to the second support surface radius 19 .
- the first active surface 11 of the piston 1 and the second support surface 12 of the transmission element 8 are thus designed to be complementary to one another.
- the first effective surface 11 of the piston 1 could also have a concave shape that deviates from the cylindrical shape.
- a convex-shaped second effective surface 15 is formed on the piston 1 .
- the second effective surface 15 of the piston 1 is a cylinder jacket section surface with a second effective surface radius 20.
- the piston is in positive engagement with the inner lateral surface 14 of the piston guide ring 13 via the second effective surface 15.
- the positive fit is effective in the direction of the center line 3 of the cylinder bore 2
- the restoring movement is transmitted to the second effective surface 15 of the piston 1 by the piston guide ring 13, ie the Movement with which the piston 1 is moved from the top dead center OT to the bottom dead center UT of the piston movement.
- the second supporting surface radius 19 of the transmission element 8 and the second effective surface radius 22 of the piston 1 have the same center point 21.
- the center point 21 corresponds to that point at which the center line 3 of the cylinder bore 2 pierces the cylinder surface 10 of the eccentric 6 .
- This design measure ensures that the sum of the radius 17 of the cylinder surface 10 and the second effective surface radius 22 of the piston 1 corresponds to the radius 23 of the inner lateral surface 14 of the piston guide ring 13 . This ensures that the piston guide ring 13 never loses contact with its inner lateral surface 14, i.e. in any angular position of the eccentric 6 or the drive shaft 4, with the second effective surface 15 of the piston 1.
- the piston guide ring 13 is always in contact (without loss of contact) with the respective piston 1 .
- This avoids additional contact changes and sliding displacement movements between the piston guide ring 13 and the piston 1, which has dynamic advantages with regard to the kinematics of the movement sequence and advantages in terms of wear. Acoustic advantages are also achieved because there are no rattling noises or other disturbing noises.
- the piston guide ring 13 guides the pistons 1 on the eccentric 6 (or on the bearing outer ring 25, cf. the following exemplary embodiments two, three and four) and prevents the piston 1 from “lifting” from the cylinder surface 10 (or the outer lateral surface 24 of the outer ring 25 of the roller bearing 26) during a downward movement/return movement of the piston 1.
- the piston guide ring 13 slides on the second active surface 15 formed on the piston 1.
- the piston guide ring 13 keeps the piston 1 and the transmission elements 8 in sliding contact with the eccentric 6 (or with an outer bearing ring 25 of a roller bearing 26 arranged on the eccentric according to the embodiments of the invention described below).
- FIG. 2 shows a second embodiment of a piston-cylinder assembly according to the invention in a radial half section.
- This second embodiment differs from the first embodiment shown in FIG. 1 in that a roller bearing 26 with an outer ring 25 and roller bodies 28 is arranged on the eccentric 6 .
- transmission elements 8 are not supported directly on the lateral surface of the eccentric 6, but are supported on the outer lateral surface 24 of the bearing outer ring 25.
- the cylinder jacket surface 10 of the eccentric is thus formed by the outer jacket surface 24 of the bearing outer ring 25 of the roller bearing 26 .
- the description of the first embodiment also applies to the second embodiment.
- the roller bearing 26 is arranged on the eccentric 6 .
- the rolling bodies 28 of the rolling bearing 26 roll directly on the lateral surface of the eccentric 6 in the exemplary embodiment shown.
- a bearing inner ring it would also be possible for a bearing inner ring to be provided, on which the rolling bodies 28 roll.
- the rolling elements 28 are held by a cage 29 or are guided by it.
- the roller bearing 26 can be designed, for example, as a needle bearing or as a cylindrical roller bearing.
- the friction is significantly reduced compared to the first embodiment of the invention.
- the outer lateral surface 24 of the bearing outer ring 25 can be hardened more easily than the lateral surface of the eccentric 6. This applies in particular when the eccentric 6 is integrally formed in one piece with the drive shaft 4 (not shown in FIG. 2). It can be advantageous to harden the surface on which the transmission elements 8 are supported with their first support surface 9 . Particularly in the case of radial piston compressors for the refrigerant CO2, hardening of the surface with which the transmission elements 8 are in contact via their first support surface may be necessary to avoid premature wear due to the high forces and surface pressures that occur. It is then easier to harden a separate outer ring of the roller bearing 26 as a single component than to harden the outer surface of an eccentric 6 that is formed integrally and in one piece with the drive shaft 4.
- Fig. 3 shows an enlarged view of area D of the second exemplary embodiment from Fig. 2.
- the radius 23 of the inner lateral surface 14 of the piston guide ring 13 and the radius 17 of the cylinder surface 10 are shown, with the cylinder surface 10 being replaced by the outer lateral surface 24 of the outer ring 25 of the roller bearing 26 is formed. Also shown are the first supporting surface radius 16 and the second effective surface radius 20.
- the first supporting surface 9 is designed as a flat, circular or disk-shaped surface, not as a concave surface as in the second exemplary embodiment.
- the transmission element 8 tilts relative to the piston 1 as a result of the movement of the eccentric 6 .
- the transmission element 8 slides with its convex-shaped second support surface 12 in relation to the concave-shaped first active surface 11 of the piston 1.
- the transmission element 8 also slides with its flat first support surface 9 relative to the outer lateral surface 24 of the outer ring 25 of the roller bearing 26.
- FIG. 5 shows a fourth embodiment of the piston-cylinder assembly according to the invention in an exploded view.
- the transmission elements 8 are supported on the outer ring 25 of the roller bearing 26 .
- the eccentric 6 is not shown in FIG.
- the second effective surface 15 of the piston 1 is also formed in exactly the same way and interacts with the inner circumferential surface 14 of the piston guide ring 13 in exactly the same way as in the first to third embodiments.
- the basic functionality corresponds to that of the first to third
- Piston 1 offers additional advantages:
- the transmission element 8 is accommodated in the ball socket of the piston 1 in an axially secured manner. Additional axial securing to prevent the transmission element 8 from moving out axially (and which is required for the transmission element 8 with the cylindrical jacket section of the second support surface 12) can be dispensed with in the case of the second support surface 12 designed as a spherical cap and the first active surface 11 designed as a ball socket will.
- Fig. 6 the piston 1 and the transmission element 8 according to the fourth embodiment of the invention are shown as individual components.
- the concave, spherical cap-shaped first active surface 11 of the piston 1 forms a ball socket (or spherical cavity) in which the convex, spherical cap-shaped second support surface 12 of the transmission element 8 is accommodated in the assembled state of the piston-cylinder assembly.
- the underside of the transmission element 8 facing the eccentric ⁇ (not shown in FIG. 6) is flat, ie the first support surface 9 is a flat surface.
- the planar first support surface 9 means that the transmission element 8 can rotate freely in the circumferential direction relative to the piston 1 . Due to the line contact with the outer lateral surface 24 of the bearing outer ring 25 (not shown in FIG. 6), the surface pressures on the transmission element 8 are admittedly higher than in a transmission element 8, which is designed according to the second embodiment of the invention. However, if the transmission element 8 is made, for example, from roller bearing steel and is hardened (for example 100Cr6 hardened), it can withstand the increased surface pressures.
- the first support surface 9 of the transmission element 8 and the first effective surface 11 of the piston 1 have a recess 30 forming a lubricant reservoir in the exemplary embodiment shown.
- Lubricant e.g. lubricating oil
- These lubricant reservoirs ensure that there is always sufficient lubricant in the contact surfaces.
- the piston-cylinder assemblies are designed according to the second embodiment of the invention, i.e. the transmission elements 8 have concave first support surfaces 9 in the shape of a section of a cylinder and the second support surfaces 12 of the transmission elements 8 are designed in the shape of a section of a cylinder and act with first active surfaces 11 in the shape of a section of a cylinder Piston 1 together.
- the piston-cylinder assemblies could also be designed according to the first, third or fourth embodiment of the invention.
- the cylinder bores 2 are arranged in a cylinder block 27 .
- the individual pistons 1 are driven via a single drive shaft 4 with an eccentric 6.
- all the details that a complete radial piston compressor has are not shown in FIG. For example, all valve arrangements and inflow and outflow channels for the refrigerant are missing. Due to the piston-cylinder assemblies according to the invention, the radial piston compressor according to FIG.
- FIG. 8 the differences between the second and the fourth embodiment of the invention are shown again in a comparison.
- the representation of A) on the left shows the second embodiment of the invention.
- the transmission element 8 has a concave cylinder jacket section surface trained first support surface 9 and designed as a convex cylinder jacket section surface second support surface 12.
- the first active surface 11 of the piston 1 is accordingly designed as a concave cylinder jacket section surface.
- the fourth embodiment of the invention is shown on the right-hand side under B).
- the transmission element 8 has a flat first support surface 9 and a second support surface 12 designed as a spherical surface section or spherical surface segment.
- the first active surface 11 of the piston 1 is accordingly designed as a ball socket.
- the second supporting surface radius 19 should always be slightly smaller than the first effective surface radius 22 on the piston 1.
- the first support surface radius 9 on the transmission element 8 should always be slightly larger than the radius 17 of the cylinder surface 10 or the radius of the outer lateral surface 24 of the outer ring 25 of the roller bearing 26.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
- Reciprocating Pumps (AREA)
- Compressor (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102020211680.6A DE102020211680A1 (de) | 2020-09-17 | 2020-09-17 | Kolben-Zylinder-Baugruppe für einen Radialkolbenverdichter sowie Radialkolbenverdichter |
| PCT/EP2021/075257 WO2022058321A1 (de) | 2020-09-17 | 2021-09-14 | Kolben-zylinder-baugruppe für einen radialkolbenverdichter sowie radialkolbenverdichter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP4214417A1 true EP4214417A1 (de) | 2023-07-26 |
| EP4214417B1 EP4214417B1 (de) | 2025-01-29 |
Family
ID=77914334
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP21777709.3A Active EP4214417B1 (de) | 2020-09-17 | 2021-09-14 | Kolben-zylinder-baugruppe für einen radialkolbenverdichter sowie radialkolbenverdichter |
Country Status (5)
| Country | Link |
|---|---|
| US (2) | US12286965B2 (de) |
| EP (1) | EP4214417B1 (de) |
| CN (2) | CN116194669B (de) |
| DE (1) | DE102020211680A1 (de) |
| WO (1) | WO2022058321A1 (de) |
Families Citing this family (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102020211680A1 (de) * | 2020-09-17 | 2022-03-17 | Thyssenkrupp Ag | Kolben-Zylinder-Baugruppe für einen Radialkolbenverdichter sowie Radialkolbenverdichter |
| DE102022202578A1 (de) | 2022-03-15 | 2023-09-21 | Thyssenkrupp Ag | Kolben-Zylinder-Baugruppe für einen Radialkolbenverdichter, sowie Radialkolbenverdichter |
| DE102022129373A1 (de) | 2022-11-07 | 2024-05-08 | Thyssenkrupp Ag | Radialkolbenverdichter |
| LU103051B1 (de) | 2022-12-16 | 2024-06-17 | Thyssenkrupp Ag | Radialkolbenverdichter, sowie Verfahren zur Montage eines Radialkolbenverdichters |
| DE102022133721A1 (de) | 2022-12-16 | 2024-06-27 | Thyssenkrupp Ag | Radialkolbenverdichter, sowie Verfahren zur Montage eines Radialkolbenverdichters |
| WO2024126399A1 (de) | 2022-12-16 | 2024-06-20 | Thyssenkrupp Dynamic Components Gmbh | Radialkolbenverdichter, sowie verfahren zur montage eines radialkolbenverdichters |
| DE102023103388A1 (de) * | 2023-02-13 | 2024-08-14 | Thyssenkrupp Ag | Radialkolbenverdichter |
| DE102023103387A1 (de) | 2023-02-13 | 2024-08-14 | Thyssenkrupp Ag | Kolben-Zylinderbohrung-Baugruppe für einen Radialkolbenverdichter sowie Radialkolbenverdichter |
| DE102023103385A1 (de) | 2023-02-13 | 2024-08-14 | Thyssenkrupp Ag | Radialkolbenverdichter, sowie Verfahren zur Montage einer Exzenterwelle in einem Radialkolbenverdichter |
| DE102023125557A1 (de) | 2023-09-20 | 2025-03-20 | Thyssenkrupp Ag | Radialkolbenverdichter |
| WO2026037660A1 (de) | 2024-08-14 | 2026-02-19 | Thyssenkrupp Dynamic Components Gmbh | Radialkolbenverdichter, sowie verfahren zur montage eines radialkolbenverdichters |
| LU103355B1 (de) | 2024-08-14 | 2026-02-16 | Thyssenkrupp Ag | Radialkolbenverdichter, sowie Verfahren zur Montage eines Radialkolbenverdichters |
| DE102024125305A1 (de) | 2024-09-04 | 2026-03-05 | Thyssenkrupp Ag | Radialkolbenverdichter |
| DE102024125298A1 (de) | 2024-09-04 | 2026-03-05 | Thyssenkrupp Ag | Radialkolbenverdichter |
| WO2026052676A1 (de) | 2024-09-04 | 2026-03-12 | Thyssenkrupp Dynamic Components Gmbh | Radialkolbenverdichter |
| DE102024125302A1 (de) | 2024-09-04 | 2026-03-05 | Thyssenkrupp Ag | Radialkolbenverdichter |
Family Cites Families (23)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB577423A (en) * | 1943-10-27 | 1946-05-17 | Vickers Armstrongs Ltd | Improvements in or relating to reciprocating pumps or motors |
| GB580320A (en) * | 1944-06-12 | 1946-09-04 | Automotive Prod Co Ltd | Improvements in or relating to reciprocating pumps |
| GB627065A (en) | 1947-01-03 | 1949-07-27 | George Joseph Trapp | Improvements in or relating to reciprocating pumps |
| GB685672A (en) * | 1951-04-11 | 1953-01-07 | Max Grassinger | Improvements in or relating to radial-cylinder pumps and compressors |
| US2818816A (en) * | 1954-12-06 | 1958-01-07 | Gen Motors Corp | Radial piston pump |
| DE1174591B (de) | 1958-10-31 | 1964-07-23 | Giovanni Bordini | Vorrichtung zur Umwandlung der hin- und hergehenden Bewegungen von sternfoermig angeordneten Kolben in eine Drehbewegung und umgekehrt |
| JPS58176484A (ja) | 1982-04-09 | 1983-10-15 | Nissan Motor Co Ltd | 往復式圧縮機 |
| US5634777A (en) * | 1990-06-29 | 1997-06-03 | Albertin; Marc S. | Radial piston fluid machine and/or adjustable rotor |
| JPH04347380A (ja) * | 1991-05-22 | 1992-12-02 | Honda Motor Co Ltd | 圧縮比調整機構付きラジアルプランジャ装置 |
| DE19626938A1 (de) | 1996-07-04 | 1998-01-08 | Wanzke Lothar | Sternförmige Kolben-Zylinderanordnung |
| DE10356373A1 (de) | 2003-12-03 | 2005-07-07 | Obrist Engineering Gmbh | Hubkolbenmaschine |
| DE102005025869B4 (de) | 2005-06-06 | 2017-04-06 | Robert Bosch Gmbh | Geräuscharme Kolbenpumpe |
| DE102006059600A1 (de) | 2006-12-18 | 2008-06-19 | Alexander Von Gencsy | Antriebseinheit, geeignet für Hochleistungs- Verdichter, - Pumpen, -Bremsen, Kraftantriebe, sowie die dazugehörigen Maschinen |
| DE102008017535B3 (de) | 2008-04-03 | 2009-08-27 | Hofer Mechatronik Gmbh | Radialkolbenpumpe |
| WO2010138509A1 (en) * | 2009-05-26 | 2010-12-02 | Husco International, Inc. | Compact eccentric radial piston hydraulic machine |
| WO2013071286A1 (en) * | 2011-11-10 | 2013-05-16 | J-Mac Tool, Inc. | Pump system |
| CN102906372B (zh) | 2010-03-23 | 2016-01-06 | R&D.有限公司 | 改进的径向液压马达 |
| EP2795204B1 (de) | 2011-12-23 | 2021-03-10 | GEA Bock GmbH | Verdichter |
| DE102012005297A1 (de) | 2012-03-19 | 2013-09-19 | Gea Bock Gmbh | Verdichtereinheit, sowie Verdichter |
| WO2014087201A1 (en) | 2012-12-07 | 2014-06-12 | Mitsubishi Heavy Industries, Ltd. | Wind turbine generator |
| JP6475538B2 (ja) | 2015-03-30 | 2019-02-27 | 三菱重工業株式会社 | 油圧機械及び再生エネルギー型発電装置 |
| DE102020211680A1 (de) * | 2020-09-17 | 2022-03-17 | Thyssenkrupp Ag | Kolben-Zylinder-Baugruppe für einen Radialkolbenverdichter sowie Radialkolbenverdichter |
| DE102021204716A1 (de) * | 2021-05-10 | 2022-11-10 | Thyssenkrupp Ag | Radialkolbenpumpe, insbesondere Radialkolbenverdichter |
-
2020
- 2020-09-17 DE DE102020211680.6A patent/DE102020211680A1/de active Pending
-
2021
- 2021-09-14 WO PCT/EP2021/075257 patent/WO2022058321A1/de not_active Ceased
- 2021-09-14 US US18/026,957 patent/US12286965B2/en active Active
- 2021-09-14 EP EP21777709.3A patent/EP4214417B1/de active Active
- 2021-09-14 CN CN202180063340.7A patent/CN116194669B/zh active Active
- 2021-09-14 CN CN202510402172.XA patent/CN120193978A/zh active Pending
-
2025
- 2025-01-28 US US19/039,581 patent/US20250172133A1/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| WO2022058321A1 (de) | 2022-03-24 |
| CN116194669B (zh) | 2025-05-30 |
| DE102020211680A1 (de) | 2022-03-17 |
| US20250172133A1 (en) | 2025-05-29 |
| US12286965B2 (en) | 2025-04-29 |
| CN116194669A (zh) | 2023-05-30 |
| US20240011475A1 (en) | 2024-01-11 |
| EP4214417B1 (de) | 2025-01-29 |
| CN120193978A (zh) | 2025-06-24 |
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